Topline Autopart 4" Oval Polished Stainless Steel Side Step Nerf Bars Rail Running Boards For 01-18 Chevy Silverado ; GMC Sierra 1500/2500 / 3500 HD Crew Cab Application: 2001-2018 Chevy Silverado 1500 / 1500 HD Crew Cab Models ; 2001-2018 Chevy Silverado 2500 / 2500 HD / 3500 / 3500 HD Crew Cab Models ; 2001-2018 GMC Sierra 1500 / 1500 HD Crew Cab Models ; 2001-2018 GMC Sierra 2500 / 2500 HD / 3500 / 3500 HD Crew Cab Models ( Attention Note: Will Fit Crew Cab Models With 4 Full Size Doors That Open In The Same Fashion ; Will Not Fit Extended Cab Models With 2 Full Size Front Doors & Half Size Backward Doors ) 4" Side Step Nerf Bars Oval Style Design Tube, Rugged Frame & Mount Design Tube For Strength & Durability Heavy Duty Polished Stainless Steel, Stainless Steel Tubes Maximizes Rust Protection Color: Polished Stainless Steel